Update build rules and patches for darwin_arm64 platform.

[gjoliver]

Changes include:

Update nelhage/rules_boost package from current version (08/5/2020) to 5/27/2021 version.
Remove rules_boost-undefine-boost_fallthrough.patch, since BOOST_FALLTHROUGH seems to be defined now.
Minor changes to rules_boost-windows-linkopts.patch to use default condition to add -lpthread flag for all platforms.
Add darwin_arm64 config to BUILD files for lib civetweb pulled in via prometheu dependency.

Why are these changes needed?

Build fixes for Apple M1 laptop.

Related issue number

#16621

Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
• [*] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • [*] Unit tests
  • Release tests
  • This PR is not tested :(

[gjoliver]

Let's see if the CI tests pass.

[wuisawesome]

I'm so excited for this to work

[gjoliver]

don't merge until the tests pass :)

[wuisawesome]

bazel-out/k8-fastbuild/bin/_virtual_includes/ray_api/boost/throw_exception.hpp:23:10: fatal error: boost/assert/source_location.hpp: No such file or directory
--
  | 23 \| #include <boost/assert/source_location.hpp>
  | \|          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | compilation terminated.
  | Target //:example failed to build

ripperoni, looks like we'll need some other changes?

[gjoliver]

huh ... it's ok, we will get there 😮‍💨

[gjoliver]

huh, windows build is actually working now. the 2 tests failed are both timeouts that have been failing all day.

[fredtony]

I'm very interested in this PR and associated issue. Thank you guys for working on it. I am a TA in a course on RL and they will be using rllib for the project. We are hoping to plug up this gap to allow everyone to run it locally, even students with an M1 Mac. Is there any way I can help to this up and running?

[gjoliver]

I'm very interested in this PR and associated issue. Thank you guys for working on it. I am a TA in a course on RL and they will be using rllib for the project. We are hoping to plug up this gap to allow everyone to run it locally, even students with an M1 Mac. Is there any way I can help to this up and running?

Thanks for the message Tony. This is already pretty much working.
I didn't push it over the finish line because of some fire fighting work lately.
I will kick of another round of CI and hopefully merge this soon.

[gjoliver]

finally all green. I even fixed a bunch of deprecation warnings caused by boost/bind.hpp.
ready to be merged.

[pcmoritz]

Great work, really glad to see this!